<template>
  <div :class="classes">
    <span
      v-for="cell in cells"
      :class="getCellCls(cell)"
      @click="handleClick(cell, $event)"
      @mouseenter="handleMouseMove(cell)"
    >
      <em>{{ cell.date.getFullYear() }}</em>
    </span>
  </div>
</template>
<script>
import { clearHours } from '../util'
import { deepCopy } from '../../../utils/assist'
import mixin from './mixin'
import prefixCls from './prefixCls'

export default {
  mixins: [mixin],

  props: {/* in mixin */},
  computed: {
    classes () {
      return [
                    `${prefixCls}`,
                    `${prefixCls}-year`
      ]
    },
    startYear () {
      return Math.floor(this.tableDate.getFullYear() / 10) * 10
    },
    cells () {
      const cells = []
      const cell_tmpl = {
        text: '',
        selected: false,
        disabled: false
      }

      const selectedDays = this.dates.filter(Boolean).map(date => clearHours(new Date(date.getFullYear(), 0, 1)))
      const focusedDate = clearHours(new Date(this.focusedDate.getFullYear(), 0, 1))

      for (let i = 0; i < 10; i++) {
        const cell = deepCopy(cell_tmpl)
        cell.date = new Date(this.startYear + i, 0, 1)
        cell.disabled = typeof this.disabledDate === 'function' && this.disabledDate(cell.date) && this.selectionMode === 'year'
        const day = clearHours(cell.date)
        cell.selected = selectedDays.includes(day)
        cell.focused = day === focusedDate
        cells.push(cell)
      }

      return cells
    }
  },
  methods: {
    getCellCls (cell) {
      return [
                    `${prefixCls}-cell`,
                    {
                      [`${prefixCls}-cell-selected`]: cell.selected,
                      [`${prefixCls}-cell-disabled`]: cell.disabled,
                      [`${prefixCls}-cell-focused`]: cell.focused,
                      [`${prefixCls}-cell-range`]: cell.range && !cell.start && !cell.end
                    }
      ]
    }
  }
}
</script>
